US20160059714A1 - Excess-length-absorbing apparatus and coil unit - Google Patents
Excess-length-absorbing apparatus and coil unit Download PDFInfo
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- US20160059714A1 US20160059714A1 US14/783,561 US201414783561A US2016059714A1 US 20160059714 A1 US20160059714 A1 US 20160059714A1 US 201414783561 A US201414783561 A US 201414783561A US 2016059714 A1 US2016059714 A1 US 2016059714A1
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- coil
- primary
- excessive length
- hook
- resonance
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- B60L11/182—
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F38/00—Adaptations of transformers or inductances for specific applications or functions
- H01F38/14—Inductive couplings
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K6/00—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00
- B60K6/20—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs
- B60K6/22—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs characterised by apparatus, components or means specially adapted for HEVs
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
- B60L53/10—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles characterised by the energy transfer between the charging station and the vehicle
- B60L53/12—Inductive energy transfer
- B60L53/122—Circuits or methods for driving the primary coil, e.g. supplying electric power to the coil
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
- H02J50/12—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling of the resonant type
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0042—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries characterised by the mechanical construction
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/10—Technologies relating to charging of electric vehicles
- Y02T90/12—Electric charging stations
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/10—Technologies relating to charging of electric vehicles
- Y02T90/14—Plug-in electric vehicles
Definitions
- the present invention relates to an excessive length absorbing apparatus and a coil unit.
- the wireless power supply adopting resonance type is configured with a power supply-side resonance circuit and a power receiving-side resonance circuit arranged apart to each other.
- the power supply-side resonance circuit and the power receiving-side resonance circuit are respectively configured with resonance coils and capacitors connected to the resonance coils.
- a resonance frequency f of the power supply-side and the power receiving-side resonance circuit is represented by the following equation (1):
- the resonance frequency f possibly deviated from the target value due to the scatter in the capacitance C of the capacitor and the inductance L of the resonance coil which occurs when manufacturing the products. Such a deviation from the target value in the resonance frequency f may have caused a decrease in transmitting efficiency.
- FIG. 4 the transmitting efficiency of the power supply system observed when a variation ranging from 0% to ⁇ 10% occurs in the capacitance C of the capacitor.
- the transmitting efficiency can be approximately 97.8%.
- the transmitting efficiency is decreased and when an error of ⁇ 10% is produced, the transmitting efficiency is decreased to as low as 94.3%.
- a turn number of the resonance coil is made adjusted so as to target the resonance frequency f even if the variation is produced in the capacitance C of the capacitor.
- the excessive length is required in the resonance coil in order to make the adjustment of the turn number possible.
- a floating inductance may be undesirably produced in accordance with the shape of the excessive length portion.
- the shape of the excessive length portion is deformed afterward, and the floating inductance or a variation in the floating inductance may cause a repeated deviation from the target value in the resonance frequency f. Such a problem as this arises.
- the present invention aims to provide an excessive length absorbing apparatus and a coil unit capable of absorbing the excessive lengths of coils with concurrent administration of the inductance.
- One aspect of the present invention is an excessive length absorbing apparatus including: a hook adapted to hook an excessive length portion of a coil to hold the excessive length portion in a U-shape; and a holding member adapted to hold the hook in a manner that position of the hook is changeable.
- Another aspect of the present invention is a coil unit including: at least one coil configuring at least one of a pair of resonance coils which performs non-contact power supply via magnetic field resonance, an electromagnetic induction coil which supplies electric power to a power supply-side of the pair of the resonance coils, and an electromagnetic induction coil to which power source is supplied from a power receiving-side of the pair of resonance coils; and the excessive length absorbing apparatus according to claim 1 that absorbs the excessive length (s) of the at least one coil.
- a first preferred aspect of the present invention is the coil unit according to the another aspect of the present invention, further includes a turn number adjustment mechanism for adjusting a turn number of the coil.
- a second preferred aspect of the present invention is the coil unit according to the first preferred aspect of the present invention, further including a base stage around which the coil is wound or on which the coil is mounted, wherein the turn number adjustment mechanism is configured with a turned-back portion provided by rewinding a portion of the coil, and wherein the base stage is provided with a plurality of guide members for hooking the coil to form the turned-back portion.
- the excessive length portion is held in a U-shape by the above described excessive length absorbing apparatus, magnetic fluxes generated in a portion toward the hook and a returning portion from the hook counteract each other. Thereby, no floating inductance is generated at the excessive length portion. Further, the holding member holds the hook in a slidable manner, the hook can be provided at a position in accordance with a length of the excessive length portion. Thereby, the excessive length of the coil can be absorbed so as not to generate the floating inductance.
- the turn number of the coil is adjusted to enable an adjustment of its impedance.
- adjustment of the impedance can be performed without relying upon the variable capacitor, and a non-contact power supply can be implemented in high efficiency.
- a shape of the turned-back portion can be maintained by a provision of the guide member.
- FIG. 1 is a view illustrating a power supply system into which an excessive length absorbing apparatus and a coil unit of the present invention are assembled.
- FIG. 2 is a graph showing a transmitting efficiency observed when the turn number of the primary resonance coil in the power supply system shown in FIG. 1 is adjusted in accordance with a variation ranging from 0% to ⁇ 10% having arisen in a capacitance of the capacitor.
- FIG. 3 is a view illustrating another embodiment of the power supply system into which an excessive length absorbing apparatus and a coil unit are assembled.
- FIG. 4 is a graph showing a transmitting efficiency observed when the turn number of the primary resonance coil in the conventional power supply system shown in FIG. 1 is adjusted in accordance with the variation ranging from 0% to ⁇ 10% having arisen in the capacitance of the capacitor.
- a power supply system 1 includes a primary coil unit 2 mounted on a ground or the like in the power source supply system provided with an alternator power source, and supplying electric power source from the alternator power source (not illustrated) in a contactless manner, and a secondary coil unit 3 mounted on a motor vehicle, receiving an electric power in a contactless manner from the primary coil unit 2 .
- the primary coil unit 2 includes a primary resonance coil 4 connected to the alternator power source, a primary core 5 as a base stage around which the primary resonance coil 4 is wound, a primary capacitor (not illustrated) for adjusting resonance frequency, which is connected to the primary resonance coil 4 , and an excessive length absorbing apparatus 6 absorbing the excessive length of the primary resonance coil 4 .
- the primary resonance coil is equivalent to the resonance coil in the present invention.
- the secondary coil unit 3 includes a secondary resonance coil 7 which is magnetic-field-resonantly interacted with the primary resonance coil 4 , a secondary core 8 as a base stage around which the secondary resonance coil 7 is wound, and a secondary capacitor (not illustrated) for adjusting resonance frequency, which is connected to the secondary resonance coil 7 .
- the above described primary, secondary resonance coils 4 , 7 are respectively wound in a helical manner around a flat plate-shaped primary and secondary cores 5 , 8 .
- the primary, secondary cores 5 , 8 are arranged juxtaposedly in parallel with each other.
- the primary and secondary resonance coils 4 , 7 are arranged in a manner that the axes of which are orthogonal to a facing direction with the primary and the secondary coil units 2 , 3 , that is, the primary and secondary resonance coils 4 , 7 are arranged in the horizontal direction.
- the power supply system 1 when electrical power from the alternator power source is supplied to the primary resonance coil 4 , the primary resonance coil 4 and the secondary resonance coil 7 are subjected to magnetic field resonance, and the electrical power is wirelessly supplied from the primary resonance coil 4 to the secondary resonance coil 7 . After the electrical power has been supplied to the secondary resonance coil 7 , the electrical power is then supplied to a load such as a battery.
- guide members 51 A and 51 B for forming a turned-back portion T as a turn number adjustment mechanism by hooking the primary resonance coil 4 are provided in plural.
- the plurality of guide members 51 A and 51 B is provided in a columnar shape protruding from the primary core 5 .
- the guide member 51 A is provided closer proximity to a central side of the primary resonance coil 4 than the other plurality of guide members 51 B.
- the primary resonance coil 4 is hooked by the guide member 51 A so that a portion of the primary resonance coil 4 is made rewound.
- the remaining plurality of guide members 51 B are juxtaposed in a line in the winding direction and are bent at 90 degrees by being hooked by the plurality of guide members 51 B to be positioned apart from the turned-back portion T.
- a change of the guide member 51 A enables an adjustment of the length of the turned-back portion T.
- the turned-back portion T does not contribute to a function as a coil since the magnetic fluxes generated in a portion along the winding direction and in a portion along the rewinding direction that are adjacent to each other counteract each other.
- an increase of the turned-back portion T can lead to a decrease of the turn number of the primary resonance coil 4 .
- a decrease of the turned-back portion T can lead to an increase of the turn number of the primary resonance coil 4 .
- the resonance frequency f between the primary and secondary resonance coils 4 , 7 possibly unfavorably deviate from the target frequency due to the variation in capacitance of the primary and secondary capacitors, for example.
- the length of turned-back portion is adjusted to change the turn number of the primary resonance coil 4 so as to eliminate the deviation of the resonance frequency f.
- the resonance frequency f is adjusted to be coincident to the target frequency.
- FIG. 2 shows a transmitting efficiency observed when the turn number of the primary resonance coil in the power supply system shown in FIG. 1 is adjusted in accordance with the variation ranging from 0% to ⁇ 10% produced in the capacitance of the primary and secondary capacitors.
- a shift in value of the resonance frequency f is likely to occur due to not only a variation of the capacitance of the primary and secondary capacitors, but also the variation of a distance between the primary and secondary coil units 2 , 3 or a variation in manufacturing the primary and secondary resonance coils 4 , 7 .
- an excessive length is provided to some extent at the connection position between the primary resonance coil 4 and the terminal fitting (not illustrated) provided at a terminal portion of the primary resonance coil 4 in order to adjust the length of the turned-back portion T.
- the excessive length absorbing apparatus 6 is adapted to absorb the excessive length portion of the primary resonance coil 4 and includes a primary hook 61 , a secondary hook 62 that functions as a hook hooking the excessive length portion of the primary resonance coil 4 to hold the excessive length portion of the primary resonance coil 4 in a U-shape, and a holding member 63 holding the secondary hook 62 in a manner that the position of the secondary hook 62 is changeable.
- the primary hook 61 is provided in a columnar shape, for example.
- the primary hook 61 is affixed in a vicinity of the primary core 5 and hooks the primary resonance coil 4 to bend the terminal portion of the primary resonance coil 4 at 90 degrees so as to extend the terminal portion in an axial direction of the primary resonance coil 4 .
- the secondary hook 62 includes a hook body 62 a and a fixed portion 62 b .
- the hook body 62 a is provided in an approximate columnar shape, and the primary resonance coil 4 in the axial direction is hooked by the primary hook 61 .
- the primary resonance coil 4 hooked by the hook body 62 a is returned toward the primary hook 61 again.
- the fixed portion 62 b is attached to the hook body 62 a and is formed in a plate-like shape extending toward the holding member 63 .
- the holding members 63 are provided in the axial direction and are arranged in a pair state as well as in a parallel state to each other. Between the pair of holding members 63 , there is positioned the hook body 62 a and there is mounted the fixed portion 62 b . In this holding member 63 , there are provided a plurality of screw holes 63 a in the axial direction. A screw hole 62 b 1 is also provided in the fixed portion 62 b . After the screw hole 62 b 1 provided in the fixed portion 62 b is made communicated to the one of the screw holes 63 a provided in the holding member 63 , they are joined to each other by screwing together. By choosing one from the screw holes 63 a provided in the fixed portion 62 b , the secondary hook 62 is position-changeably held in the axial direction.
- the magnetic fluxes generated in the portion from the primary hook 61 to the secondary hook 62 , and a returning portion from the secondary hook 62 counteract each other. Thereby, no floating inductance is generated at the excessive length portion.
- the holding member 63 holds the secondary hook 62 in the axial direction in a manner that the position of the secondary hook 62 is unchanged. Thereby, even if the length of the excessive length portion is changed by the adjustment of the length of the turned-back portion T, the secondary hook 62 can be provided at a position in accordance with the length of the excessive length portion.
- the excessive length of the primary resonance coil 4 can be absorbed so as not to produce a floating inductance.
- the turn number of the primary resonance coil 4 can be optimized to adjust its impedance.
- an adjustment of the impedance can be implemented without relying upon the variable capacitor, and a non-contact power supply in high efficiency can be enabled.
- the guide members 51 A and 51 B which constitute the turned-back portion T a shape of the turned-back portion T can be easily maintained.
- the holding member 63 is provided in the axial direction of the primary resonance coil 4 and the holding member 63 holds the secondary hook 62 in a manner that the secondary hook 62 is position-changeable, they are not limited thereto.
- the holding member 63 only has to be capable of changing the length of the excessive length portion held in a U-shape.
- the holding member 63 may be provided in the winding direction.
- the plurality of guide member 51 A and 51 B are provided in a convex shape in the primary core 5 , they are not limited thereto.
- the turned-back portion T may be provided by fitting the primary resonance coil 4 into a guide member which is formed by a plurality of U-shaped grooves having different lengths provided at the primary core 5 .
- the primary hook 61 and the secondary hook 62 are provided in a columnar shape, they are not limited thereto.
- the primary hook 61 and the secondary hook 62 only have to be capable of hooking the primary resonance coil 4 .
- they may be provided in hook shapes.
- the turned-back portion T is provided at the primary resonance coil 4 and the excessive length absorbing apparatus 6 is provided at the primary coil unit 2 , the present invention is not limited thereto. In a case where the turned-back portion T is also provided at the secondary resonance coil 7 , the excessive length absorbing apparatus can also be provided at the secondary coil unit 3 .
- multiple guide members 51 B are provided in a juxtaposed manner, they are not limited thereto.
- the length of the turned-back portion T may be made adjusted by optimizing the position of the guide member 51 B.
- the guide member 51 B is provided in a singular and a moveable manner.
- the primary and secondary resonance coils 4 , 7 are helically wound around the primary core 5 and the secondary core 8 , the shapes of the primary and secondary resonance coils 4 , 7 are not limited thereto.
- the primary and secondary resonance coils 4 , 7 may be wound in a spiral manner as shapes of them.
- the axes of the primary and secondary resonance coils 4 , 7 are arranged in the horizontal direction, they are not limited thereto.
- the primary and secondary resonance coils 4 , 7 may be arranged in a coaxial manner in relation to each other.
- an excessive length absorbing apparatus may be provided at an entity which adjusts the turn number by the wedge W representing the turn number adjustment mechanism as shown in FIG. 3 .
- the wedge W is mounted on the primary core 5 and provided in an almost box-shaped.
- the wedge W is provided in the winding direction of the primary resonance coil 4 in a longitudinally-shape.
- the wedge W is provided with an inclined surface W 1 inclined so as to be gradually higher toward the first end portion of the primary resonance coil 4 .
- the inclined surface W 1 is provided with a linearly-shaped housing groove W 2 which accommodates the first end portion of the primary resonance coil 4 , and the first end portion of the primary resonance coil 4 is accommodated within the linearly-shaped housing groove W 2 .
- the one end portion of the primary resonance coil 4 which is a portion mounted on the wedge W is positioned apart from the other portions. Hence, the portion of the primary resonance coil 4 mounted on the wedge W does not serve to a function of the coil. Thus, when the wedge W is moved to a side apart from the first end portion of the primary resonance coil 4 , the end portion length of the primary resonance coil 4 mounted on the wedge W is increased. Thereby, the turn number of the primary resonance coil 4 is allowed to decrease. In this situation, the excessive length portion of the primary resonance coil 4 is made shortened.
- the excessive length of the primary resonance coil 4 can be absorbed avoiding a production of a floating inductance.
- the excessive length absorbing apparatus 6 is provided in order to absorb the excessive lengths of the resonance coils 4 , 7 , the present invention is not limited thereto.
- the excessive length absorbing apparatus 6 may be provided to absorb the excessive length of the primary electromagnetic induction coil.
- the excessive length absorbing apparatus 6 may be provided to absorb the excessive length of the secondary electromagnetic induction coil.
- a member such as a turned-back portion T or a wedge W is likely to be provided to adjust its impedance.
- the above descried embodiments merely show a representative embodiment of the present invention, thus, the present invention is not limited thereto. That is, the present invention can be implemented in various modifications without departing from the gist of the present invention.
Abstract
Description
- The present invention relates to an excessive length absorbing apparatus and a coil unit.
- In recent years, attention is being attracted to wireless power supply that does not use power source codes and power transmitting cables as a power supply system that supplies to batteries mounted on, such as, hybrid cars or electrically-powered cars. A resonance type as one of this wireless power supply techniques is known (refer to PTL 1).
- The wireless power supply adopting resonance type is configured with a power supply-side resonance circuit and a power receiving-side resonance circuit arranged apart to each other. The power supply-side resonance circuit and the power receiving-side resonance circuit are respectively configured with resonance coils and capacitors connected to the resonance coils.
- A resonance frequency f of the power supply-side and the power receiving-side resonance circuit is represented by the following equation (1):
-
f=1/(2πsqrt(LC)) (1) - where L denotes the inductance of the resonance coil, and C denotes the capacitance of the capacitor.
By having the power supply-side resonance circuit and the power receiving-side resonance circuit to be resonant, electric supply is enabled from the power supply-side to the power receiving-side in a contactless manner. - However, in the aforementioned power supply system, the resonance frequency f possibly deviated from the target value due to the scatter in the capacitance C of the capacitor and the inductance L of the resonance coil which occurs when manufacturing the products. Such a deviation from the target value in the resonance frequency f may have caused a decrease in transmitting efficiency. There is shown in
FIG. 4 the transmitting efficiency of the power supply system observed when a variation ranging from 0% to ±10% occurs in the capacitance C of the capacitor. - As shown in the figure, when the capacitance C of the capacitor is at the target capacitance, the transmitting efficiency can be approximately 97.8%. However, as the difference between the capacitance C of the capacitor and the target capacitance is increased, the transmitting efficiency is decreased and when an error of −10% is produced, the transmitting efficiency is decreased to as low as 94.3%.
- Then, it can be considered that a turn number of the resonance coil is made adjusted so as to target the resonance frequency f even if the variation is produced in the capacitance C of the capacitor. However, the excessive length is required in the resonance coil in order to make the adjustment of the turn number possible. In a state where the excessive length can be arbitrarily deformed, a floating inductance may be undesirably produced in accordance with the shape of the excessive length portion. Thus, even if the turn number is made adjusted, the shape of the excessive length portion is deformed afterward, and the floating inductance or a variation in the floating inductance may cause a repeated deviation from the target value in the resonance frequency f. Such a problem as this arises.
-
- Patent Literature 1: JP 2009-501510 T
- In view thereof, the present invention aims to provide an excessive length absorbing apparatus and a coil unit capable of absorbing the excessive lengths of coils with concurrent administration of the inductance.
- One aspect of the present invention is an excessive length absorbing apparatus including: a hook adapted to hook an excessive length portion of a coil to hold the excessive length portion in a U-shape; and a holding member adapted to hold the hook in a manner that position of the hook is changeable.
- Another aspect of the present invention is a coil unit including: at least one coil configuring at least one of a pair of resonance coils which performs non-contact power supply via magnetic field resonance, an electromagnetic induction coil which supplies electric power to a power supply-side of the pair of the resonance coils, and an electromagnetic induction coil to which power source is supplied from a power receiving-side of the pair of resonance coils; and the excessive length absorbing apparatus according to
claim 1 that absorbs the excessive length (s) of the at least one coil. - A first preferred aspect of the present invention is the coil unit according to the another aspect of the present invention, further includes a turn number adjustment mechanism for adjusting a turn number of the coil.
- A second preferred aspect of the present invention is the coil unit according to the first preferred aspect of the present invention, further including a base stage around which the coil is wound or on which the coil is mounted, wherein the turn number adjustment mechanism is configured with a turned-back portion provided by rewinding a portion of the coil, and wherein the base stage is provided with a plurality of guide members for hooking the coil to form the turned-back portion.
- As described above, according to the invention set forth in the one aspect or the another aspect of the present invention, since the excessive length portion is held in a U-shape by the above described excessive length absorbing apparatus, magnetic fluxes generated in a portion toward the hook and a returning portion from the hook counteract each other. Thereby, no floating inductance is generated at the excessive length portion. Further, the holding member holds the hook in a slidable manner, the hook can be provided at a position in accordance with a length of the excessive length portion. Thereby, the excessive length of the coil can be absorbed so as not to generate the floating inductance.
- As described above, according to the first preferred aspect of the present invention, the turn number of the coil is adjusted to enable an adjustment of its impedance. Thereby, adjustment of the impedance can be performed without relying upon the variable capacitor, and a non-contact power supply can be implemented in high efficiency.
- According to the second preferred aspect of the present invention, a shape of the turned-back portion can be maintained by a provision of the guide member.
-
FIG. 1 is a view illustrating a power supply system into which an excessive length absorbing apparatus and a coil unit of the present invention are assembled. -
FIG. 2 is a graph showing a transmitting efficiency observed when the turn number of the primary resonance coil in the power supply system shown inFIG. 1 is adjusted in accordance with a variation ranging from 0% to ±10% having arisen in a capacitance of the capacitor. -
FIG. 3 is a view illustrating another embodiment of the power supply system into which an excessive length absorbing apparatus and a coil unit are assembled. -
FIG. 4 is a graph showing a transmitting efficiency observed when the turn number of the primary resonance coil in the conventional power supply system shown inFIG. 1 is adjusted in accordance with the variation ranging from 0% to ±10% having arisen in the capacitance of the capacitor. - Hereinafter, a power supply system of the present invention into which an excessive length absorbing apparatus and a coil unit are assembled is described with reference to
FIG. 1 . As illustrated in the drawing, apower supply system 1 includes aprimary coil unit 2 mounted on a ground or the like in the power source supply system provided with an alternator power source, and supplying electric power source from the alternator power source (not illustrated) in a contactless manner, and asecondary coil unit 3 mounted on a motor vehicle, receiving an electric power in a contactless manner from theprimary coil unit 2. - The
primary coil unit 2 includes aprimary resonance coil 4 connected to the alternator power source, aprimary core 5 as a base stage around which theprimary resonance coil 4 is wound, a primary capacitor (not illustrated) for adjusting resonance frequency, which is connected to theprimary resonance coil 4, and an excessivelength absorbing apparatus 6 absorbing the excessive length of theprimary resonance coil 4. The primary resonance coil is equivalent to the resonance coil in the present invention. - The
secondary coil unit 3 includes asecondary resonance coil 7 which is magnetic-field-resonantly interacted with theprimary resonance coil 4, asecondary core 8 as a base stage around which thesecondary resonance coil 7 is wound, and a secondary capacitor (not illustrated) for adjusting resonance frequency, which is connected to thesecondary resonance coil 7. - The above described primary,
secondary resonance coils secondary cores secondary cores secondary resonance coils secondary coil units secondary resonance coils - According to the
power supply system 1 as aforementioned, when electrical power from the alternator power source is supplied to theprimary resonance coil 4, theprimary resonance coil 4 and thesecondary resonance coil 7 are subjected to magnetic field resonance, and the electrical power is wirelessly supplied from theprimary resonance coil 4 to thesecondary resonance coil 7. After the electrical power has been supplied to thesecondary resonance coil 7, the electrical power is then supplied to a load such as a battery. - Further, in the
primary core 5, guidemembers primary resonance coil 4 are provided in plural. The plurality ofguide members primary core 5. Theguide member 51A is provided closer proximity to a central side of theprimary resonance coil 4 than the other plurality ofguide members 51B. Theprimary resonance coil 4 is hooked by theguide member 51A so that a portion of theprimary resonance coil 4 is made rewound. - The remaining plurality of
guide members 51B are juxtaposed in a line in the winding direction and are bent at 90 degrees by being hooked by the plurality ofguide members 51B to be positioned apart from the turned-back portion T. A change of theguide member 51A enables an adjustment of the length of the turned-back portion T. - The turned-back portion T does not contribute to a function as a coil since the magnetic fluxes generated in a portion along the winding direction and in a portion along the rewinding direction that are adjacent to each other counteract each other. Thus, an increase of the turned-back portion T can lead to a decrease of the turn number of the
primary resonance coil 4. By contrast thereto, a decrease of the turned-back portion T can lead to an increase of the turn number of theprimary resonance coil 4. - The resonance frequency f between the primary and
secondary resonance coils primary resonance coil 4 so as to eliminate the deviation of the resonance frequency f. Thereby, the resonance frequency f is adjusted to be coincident to the target frequency. -
FIG. 2 shows a transmitting efficiency observed when the turn number of the primary resonance coil in the power supply system shown inFIG. 1 is adjusted in accordance with the variation ranging from 0% to ±10% produced in the capacitance of the primary and secondary capacitors. By comparingFIG. 2 toFIG. 4 , it is apparent that according to the conventional technique, the transmitting efficiency is decreased to as low as 94.3% when an error of −10% is produced, to the contrary, according to this embodiment, the transmitting efficiency can be maintained at as high as approximately 97% even if the error of −10% is produced. Incidentally, a shift in value of the resonance frequency f is likely to occur due to not only a variation of the capacitance of the primary and secondary capacitors, but also the variation of a distance between the primary andsecondary coil units - As descried above, an excessive length is provided to some extent at the connection position between the
primary resonance coil 4 and the terminal fitting (not illustrated) provided at a terminal portion of theprimary resonance coil 4 in order to adjust the length of the turned-back portion T. The excessivelength absorbing apparatus 6 is adapted to absorb the excessive length portion of theprimary resonance coil 4 and includes aprimary hook 61, asecondary hook 62 that functions as a hook hooking the excessive length portion of theprimary resonance coil 4 to hold the excessive length portion of theprimary resonance coil 4 in a U-shape, and a holdingmember 63 holding thesecondary hook 62 in a manner that the position of thesecondary hook 62 is changeable. - The
primary hook 61 is provided in a columnar shape, for example. Theprimary hook 61 is affixed in a vicinity of theprimary core 5 and hooks theprimary resonance coil 4 to bend the terminal portion of theprimary resonance coil 4 at 90 degrees so as to extend the terminal portion in an axial direction of theprimary resonance coil 4. - The
secondary hook 62 includes ahook body 62 a and a fixedportion 62 b. Thehook body 62 a is provided in an approximate columnar shape, and theprimary resonance coil 4 in the axial direction is hooked by theprimary hook 61. Theprimary resonance coil 4 hooked by thehook body 62 a is returned toward theprimary hook 61 again. The fixedportion 62 b is attached to thehook body 62 a and is formed in a plate-like shape extending toward the holdingmember 63. - The holding
members 63 are provided in the axial direction and are arranged in a pair state as well as in a parallel state to each other. Between the pair of holdingmembers 63, there is positioned thehook body 62 a and there is mounted the fixedportion 62 b. In this holdingmember 63, there are provided a plurality of screw holes 63 a in the axial direction. Ascrew hole 62b 1 is also provided in the fixedportion 62 b. After thescrew hole 62b 1 provided in the fixedportion 62 b is made communicated to the one of the screw holes 63 a provided in the holdingmember 63, they are joined to each other by screwing together. By choosing one from the screw holes 63 a provided in the fixedportion 62 b, thesecondary hook 62 is position-changeably held in the axial direction. - Since the excessive length portion is held in a U-shape by the above described excessive
length absorbing apparatus 6, the magnetic fluxes generated in the portion from theprimary hook 61 to thesecondary hook 62, and a returning portion from thesecondary hook 62 counteract each other. Thereby, no floating inductance is generated at the excessive length portion. Further, the holdingmember 63 holds thesecondary hook 62 in the axial direction in a manner that the position of thesecondary hook 62 is unchanged. Thereby, even if the length of the excessive length portion is changed by the adjustment of the length of the turned-back portion T, thesecondary hook 62 can be provided at a position in accordance with the length of the excessive length portion. Thus, the excessive length of theprimary resonance coil 4 can be absorbed so as not to produce a floating inductance. - According to the above described embodiment, by providing the turned-back portion T, the turn number of the
primary resonance coil 4 can be optimized to adjust its impedance. Thereby, an adjustment of the impedance can be implemented without relying upon the variable capacitor, and a non-contact power supply in high efficiency can be enabled. Furthermore, by providing theguide members - According to the above described embodiment, although the holding
member 63 is provided in the axial direction of theprimary resonance coil 4 and the holdingmember 63 holds thesecondary hook 62 in a manner that thesecondary hook 62 is position-changeable, they are not limited thereto. The holdingmember 63 only has to be capable of changing the length of the excessive length portion held in a U-shape. For example, the holdingmember 63 may be provided in the winding direction. - According to the above described embodiment, although the plurality of
guide member primary core 5, they are not limited thereto. For example, the turned-back portion T may be provided by fitting theprimary resonance coil 4 into a guide member which is formed by a plurality of U-shaped grooves having different lengths provided at theprimary core 5. - According to the above described embodiment, although the
primary hook 61 and thesecondary hook 62 are provided in a columnar shape, they are not limited thereto. Theprimary hook 61 and thesecondary hook 62 only have to be capable of hooking theprimary resonance coil 4. For example, they may be provided in hook shapes. - According to the above described embodiment, although the turned-back portion T is provided at the
primary resonance coil 4 and the excessivelength absorbing apparatus 6 is provided at theprimary coil unit 2, the present invention is not limited thereto. In a case where the turned-back portion T is also provided at thesecondary resonance coil 7, the excessive length absorbing apparatus can also be provided at thesecondary coil unit 3. - According to the above described embodiment, although in the
primary core 5,multiple guide members 51B are provided in a juxtaposed manner, they are not limited thereto. For example, the length of the turned-back portion T may be made adjusted by optimizing the position of theguide member 51B. Theguide member 51B is provided in a singular and a moveable manner. - According to the above described embodiment, although the primary and secondary resonance coils 4, 7 are helically wound around the
primary core 5 and thesecondary core 8, the shapes of the primary and secondary resonance coils 4, 7 are not limited thereto. The primary and secondary resonance coils 4, 7 may be wound in a spiral manner as shapes of them. - According to the above described embodiment, although the axes of the primary and secondary resonance coils 4, 7 are arranged in the horizontal direction, they are not limited thereto. The primary and secondary resonance coils 4, 7 may be arranged in a coaxial manner in relation to each other.
- According to the above described embodiment, although described in a case where the turned-back portion T is provided as the turn number adjustment mechanism, the present invention is not limited thereto. For example, an excessive length absorbing apparatus may be provided at an entity which adjusts the turn number by the wedge W representing the turn number adjustment mechanism as shown in
FIG. 3 . - The wedge W is mounted on the
primary core 5 and provided in an almost box-shaped. The wedge W is provided in the winding direction of theprimary resonance coil 4 in a longitudinally-shape. The wedge W is provided with an inclined surface W1 inclined so as to be gradually higher toward the first end portion of theprimary resonance coil 4. The inclined surface W1 is provided with a linearly-shaped housing groove W2 which accommodates the first end portion of theprimary resonance coil 4, and the first end portion of theprimary resonance coil 4 is accommodated within the linearly-shaped housing groove W2. - The one end portion of the
primary resonance coil 4, which is a portion mounted on the wedge W is positioned apart from the other portions. Hence, the portion of theprimary resonance coil 4 mounted on the wedge W does not serve to a function of the coil. Thus, when the wedge W is moved to a side apart from the first end portion of theprimary resonance coil 4, the end portion length of theprimary resonance coil 4 mounted on the wedge W is increased. Thereby, the turn number of theprimary resonance coil 4 is allowed to decrease. In this situation, the excessive length portion of theprimary resonance coil 4 is made shortened. - By contrast thereto, when the wedge W is moved to the one end portion of the
primary resonance coil 4, an end portion length of theprimary resonance coil 4 mounted on the wedge W is decreased, thereby, the turn number of theprimary resonance coil 4 is allowed to increase. In this situation, the excessive length portion of theprimary resonance coil 4 is made elongated. - As described above, since the length of the excessive length portion is changed by the turn number adjustment of the wedge W, by locating the
secondary hook 62 in a position in accordance with the length of the excessive length portion, the excessive length of theprimary resonance coil 4 can be absorbed avoiding a production of a floating inductance. - According to the above described embodiment, although the excessive
length absorbing apparatus 6 is provided in order to absorb the excessive lengths of the resonance coils 4, 7, the present invention is not limited thereto. For example, in a case where theprimary resonance coil 4 is not directly connected to the alternator power source and is therefore power supplied from the alternator power source via electromagnetic induction with the primary electromagnetic induction coil, the excessivelength absorbing apparatus 6 may be provided to absorb the excessive length of the primary electromagnetic induction coil. - Further, in a case where the
secondary resonance coil 7 is not directly connected to a load such as a battery, and supplies a power source to the load via electromagnetic induction with the secondary electromagnetic induction coil, the excessivelength absorbing apparatus 6 may be provided to absorb the excessive length of the secondary electromagnetic induction coil. In the primary and secondary electromagnetic induction coils, a member such as a turned-back portion T or a wedge W is likely to be provided to adjust its impedance. - Incidentally, the above descried embodiments merely show a representative embodiment of the present invention, thus, the present invention is not limited thereto. That is, the present invention can be implemented in various modifications without departing from the gist of the present invention.
-
Reference Signs List 2 primary coil unit (coil unit) 3 secondary coil unit (coil unit) 4 primary resonance coil (resonance coil) 5 primary core (base stage) 7 secondary resonance coil (resonance coil) 8 secondary core (base stage) 6 excessive length absorbing apparatus 51A guide member 51B guide member 62 secondary hook (hook) 63 holding member T turned-back portion (turn number adjustment mechanism) W wedge (turn number adjustment mechanism)
Claims (4)
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
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JP2013086310A JP6103527B2 (en) | 2013-04-17 | 2013-04-17 | Surplus length absorber and coil unit |
JP2013-086310 | 2013-04-17 | ||
PCT/JP2014/060660 WO2014171432A1 (en) | 2013-04-17 | 2014-04-15 | Excess-length-absorbing apparatus and coil unit |
Publications (2)
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US20160059714A1 true US20160059714A1 (en) | 2016-03-03 |
US10239411B2 US10239411B2 (en) | 2019-03-26 |
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US14/783,561 Active 2034-11-01 US10239411B2 (en) | 2013-04-17 | 2014-04-15 | Excess-length-absorbing apparatus and coil unit |
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US (1) | US10239411B2 (en) |
JP (1) | JP6103527B2 (en) |
DE (1) | DE112014002013T5 (en) |
WO (1) | WO2014171432A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
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US11170922B2 (en) | 2016-09-02 | 2021-11-09 | Ihi Corporation | Coil device and holder |
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EA037300B1 (en) | 2016-04-20 | 2021-03-05 | Бристол-Маерс Сквибб Компани | Substituted bicyclic heterocyclic compounds |
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US3975855A (en) * | 1975-05-30 | 1976-08-24 | Trimarc Corporation | Telescopic spin/fly combination fishing rod |
US6001471A (en) * | 1995-08-11 | 1999-12-14 | 3M Innovative Properties Company | Removable adhesive tape with controlled sequential release |
US7690594B2 (en) * | 2007-02-20 | 2010-04-06 | Fujifilm Corporation | Recording tape cartridge |
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JPH0381U (en) * | 1989-05-19 | 1991-01-07 | ||
US4980663A (en) | 1989-12-28 | 1990-12-25 | Ford Motor Company | Automated adjustment of air-core coil inductance |
JPH056818A (en) * | 1991-06-27 | 1993-01-14 | Mitsubishi Electric Corp | Magnetic coil apparatus |
EP2306616B2 (en) | 2005-07-12 | 2023-06-21 | Massachusetts Institute of Technology (MIT) | Wireless non-radiative energy transfer |
JP4911148B2 (en) | 2008-09-02 | 2012-04-04 | ソニー株式会社 | Contactless power supply |
JP5353376B2 (en) | 2009-03-31 | 2013-11-27 | 富士通株式会社 | Wireless power device and wireless power receiving method |
-
2013
- 2013-04-17 JP JP2013086310A patent/JP6103527B2/en active Active
-
2014
- 2014-04-15 DE DE112014002013.3T patent/DE112014002013T5/en active Pending
- 2014-04-15 US US14/783,561 patent/US10239411B2/en active Active
- 2014-04-15 WO PCT/JP2014/060660 patent/WO2014171432A1/en active Application Filing
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
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US3975855A (en) * | 1975-05-30 | 1976-08-24 | Trimarc Corporation | Telescopic spin/fly combination fishing rod |
US6001471A (en) * | 1995-08-11 | 1999-12-14 | 3M Innovative Properties Company | Removable adhesive tape with controlled sequential release |
US7690594B2 (en) * | 2007-02-20 | 2010-04-06 | Fujifilm Corporation | Recording tape cartridge |
US20140091635A1 (en) * | 2012-09-28 | 2014-04-03 | Denso Corporation | Wireless power supply apparatus, filter unit and power supply apparatus for robot using the filter unit |
US20140203661A1 (en) * | 2013-01-21 | 2014-07-24 | Powermat Technologies, Ltd. | Inductive power receiver having dual mode connector for portable electrical devices |
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Publication number | Priority date | Publication date | Assignee | Title |
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US11170922B2 (en) | 2016-09-02 | 2021-11-09 | Ihi Corporation | Coil device and holder |
Also Published As
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JP6103527B2 (en) | 2017-03-29 |
DE112014002013T5 (en) | 2016-01-07 |
WO2014171432A1 (en) | 2014-10-23 |
JP2014212153A (en) | 2014-11-13 |
US10239411B2 (en) | 2019-03-26 |
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